# How to find pixel per meter

I have a static camera through which I am focusing on the covered area, total covered area by a camera is

```
length 78.7 cm
width 102.1 cm
heigh 118.5 cm
```

my image size is `800 * 480`

now in the total covered area, I have another box whose

```
length is 22.6 cm
width is 25.6 cm
height is 24 cm
```

I want to find out how many pixels I have per meter. I am using the formula of

`m/pixels * 0.39`

but it's not giving the exact answer.